Control Methods
P/N 7010-0341 www.topconpositioning.com
2-15
• Mix characteristics
– Gradation
– Segregation
– Mix Temperature
• Screed Compaction
• Quality of Base Being Paved
• Rolling Techniques
NOTICE
NOTICE
Changes in any of these factors will cause a
change in mat thickness, density, surface
appearance and mat quality. If changes must be
made, make them as gradually as possible.
Abrupt changes in any of the above factors will
produce rapid changes in mat thickness,
adversely affecting mat quality.
Control Methods
The following sections describe the three types of control possible
with the Pave System Five: sonic, laser, and slope.
Sonic Control
The Sonic Tracker II™ measures and controls the elevation of
the screed, controlling grade from a physical grade reference,
such as a curb, stringline, or existing road surface.
A transducer, located in the bottom of the Tracker, generates 39
sound pulses per second and listens for returned echoes like a
microphone. As soon as the Tracker sends out a sound wave, it
starts a stop watch. The sound waves go down, bounce off of a
physical reference, and reflect back to the Tracker. The Tracker
measures the time it takes for the sound wave to return to the
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